Fundraising Fox

Tobias Estreen

Founder

Founder at Stilta

Stockholm, Stockholm County, Sweden

FoundedStilta · YC

About

Tobias Estreen is co-founder of Stilta. He previously worked at QuantumBlack (McKinsey & Company) developing agentic AI systems for enterprise clients, and holds background in physics and machine learning from KTH and KU Leuven.

Founder at StiltaYC W26

Intro paths

YC

Tobias went through Y Combinator (Winter 2026) — any YC alum in your network can reach them through the YC community.

GP

Their group partner at YC was Gustaf Alstromer — the partner who ran Stilta's batch and knows the company first-hand. YC profile ↗

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In turn, Tobias can intro founders to Stilta's investors below.

Stilta's investors · 3

Andreessen HorowitzMenlo Park · $500K – $50M checks · since 2026Inception Fund$110K – $1.1M checksY CombinatorSan Francisco · $500K checks · since 2026

Co-founders at Stilta

OBOskar Block
Oskar BlockFounder
OAOscar Adamsson
Oscar AdamssonFounder
PWPetrus Werner
Petrus WernerCo-founder & CTO

Experience

  1. StiltaCTO & Co-Foundercurrent2026 — presentСан-Франциско, CA
  2. QuantumBlack, AI by McKinseyLead Data Scientist2022 — 2025Stockholms kommun
  3. NetlightMachine Learning Engineer2020 — 2022Stockholms län, Sverige
  4. Amici ExperienceCo-Founder2020 — 2022Stockholms kommun
  5. NetsponsCo-Founder2018 — 2020Greater Stockholm Metropolitan Area
  6. ZENUITYMachine Learning Engineer2019Greater Stockholm Metropolitan Area
  7. SafeCOPSimulation of Autonomous Vehicles2018 — 2019Greater Stockholm Metropolitan Area
  8. Osser Brosoft ABFull-stack Developer2016Stockholm, Sverige

Skills & more

Python2JavaScript2PHP1SQLGitApacheLinuxRC#JavaMatlabLaTeX
+12 moreMicrosoft OfficeMicrosoft ExcelHTMLCSSUnityReact.jsAmazon webbtjänster (AWS)MySQLEngelskaDatavisualiseringDatorsynKonsulttjänster

From Tobias's professional profile.

Frequently asked questions

Who is Tobias Estreen?
Tobias Estreen is co-founder of Stilta. He previously worked at QuantumBlack (McKinsey & Company) developing agentic AI systems for enterprise clients, and holds background in physics and machine learning from KTH and KU Leuven.
Where does Tobias Estreen work?
Tobias Estreen is Founder of Stilta.
What companies did Tobias Estreen found?
Tobias Estreen founded Stilta.
Where did Tobias Estreen go to school?
Tobias Estreen studied at Y Combinator (YC W26); KTH Royal Institute of Technology (Engineering Physics / Machine Learning); KU Leuven (Artificial intelligence).

Founder mafias

Y Combinator mafia8,773

Also came through, then founded or led a company.

Sam AltmanPresidentFounded Tools for Humanity +3Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianYC Summer 2005Founded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded HotspotsTrae StephensYC Winter 2022Founded Pursuit +1

+ 8,766 more

Y Combinator mafia4,716

Also came through, then founded or led a company.

Ryan SheaEntrepreneurshipFounded StacksTarek MansourFounded KalshiSuhail DoshiEating beans & riceFounded Playground +1Subomi OluwalanaW22Founded ConvoyDarius "Bubs" MonsefS19Founded Sightbox +3Matthew ScholzFounded Oisin Biotechnologies +3

+ 4,709 more

KTH Royal Institute of Technology mafia40

Also came through, then founded or led a company.

Ali GhodsiPhDFounded DatabricksMagnus HambletonMaster of ScienceFounded Founders Pledge +2Per NordlingMaster's degreeFounded Younium +1Linus MalménDegree Progr. in Mechanical EngineeringFounded Zaver +1Rajiv DatarFounded Chromatan, Inc.Eric Quidenus-WahlforssMAFounded SoundCloud

+ 33 more

KU Leuven mafia24

Also came through, then founded or led a company.

Pieter AbbeelBS/MSFounded Gradescope +1Peter VanbekbergenFounded Imec Xpand +1Dieter De MesmaekerMaster in Industrial SciencesFounded DataCamp +1Herman VerrelstMaster in EngineeringFounded BiocartisChiara BagainiBachelor of Business Administration - BBAFounded RepathLaurens De PoorterBachelor (BSc) & Master of Science (MSc)Founded Belfort

+ 17 more

Same school

Also attended Y Combinator2,000

Tarek MansourCo-founder & CEO of KalshiSuhail DoshiFounder of Mixpanel; founder of ParticleSubomi OluwalanaCo-founder & CEO of ConvoyMaroof AhmedFounder at Octopus VenturesJustin SwartPartner at Bitkraft Esports VenturesCollin WallaceGeneral Partner at Lobby Capital

+ 1,994 more

Also attended KTH Royal Institute of Technology135

Ali GhodsiCo-founder & CEO of DatabricksWilliam JilltoftDirector of Strategy and Operations at NorthzoneJohanna OlnénData Analyst at NorthzoneRobin WänlundAssociate at Notion CapitalMagnus BergmanInvestor at Luminar VenturesGiuseppe LacerenzaPartner at Keen Venture Partners

+ 129 more

Also attended KU Leuven176

Katrin GeyskensExecutive Director at Capricorn Venture PartnersSimon WoutersInvestment Manager at Capricorn Venture PartnersSteven LambertInvestment Partner Digital at Capricorn Venture PartnersAntoine D'HollanderInvestment Director at Capricorn Venture PartnersWouter Van de PutteInvestment Director at Capricorn Venture PartnersFilip PintelonInvestment Partner Health at Capricorn Venture Partners

+ 170 more

Shared employers

Also worked at Stilta3

Oskar BlockFounder at StiltaOscar AdamssonFounder at StiltaPetrus WernerCo-founder & CTO at Stilta

Also worked at QuantumBlack, AI by McKinsey18

Raja GhawiPartner at Era VenturesLucille ConroyPrincipal at AbingworthAlexandre ChavotierAI Consultant at Five V CapitalOlivia CavlanPartner at LifeArc VenturesEdoardo ItaliaAssociate at Brighton Park CapitalMohamed Eisimat MohamedInvestor at Atomico

+ 12 more

Also worked at Netlight2

Johanna OlnénData Analyst at NorthzonePorsev AslanCo-founder & CTO at Openroll